In robot building I never use spanners/wrenches, for all my bolts I either use an adjustable if it is huge or I use one of the Makita multibit screwdriver that just is just like a manual screwdriver but lets you change the bit in the end like on a cordless drill. You get socket head bits or bolt heads and then can use it for screw heads as well, then the same bits can go into my cordless drill if I've got a lot to do. I never go to an event without it.